123655 has 8 divisors (see below), whose sum is σ = 169632. Its totient is φ = 84768.

The previous prime is 123653. The next prime is 123661. The reversal of 123655 is 556321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123655 - 2¹ = 123653 is a prime.

It is a Duffinian number.

123655 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1732 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (21204).

2¹²³⁶⁵⁵ is an apocalyptic number.

123655 is a deficient number, since it is larger than the sum of its proper divisors (45977).

123655 is an equidigital number, since it uses as much as digits as its factorization.

123655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3545.

The product of its digits is 900, while the sum is 22.

The square root of 123655 is about 351.6461289422. The cubic root of 123655 is about 49.8200195850.

Adding to 123655 its reverse (556321), we get a palindrome (679976).

The spelling of 123655 in words is "one hundred twenty-three thousand, six hundred fifty-five".